Dictionary.com
definitions

League of Nations

noun
  1. an international organization to promote world peace and cooperation that was created by the Treaty of Versailles (1919): dissolved April 1946.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for league of nations

League of Nations

noun
  1. an international association of states founded in 1920 with the aim of preserving world peace: dissolved in 1946
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
league of nations in Culture

League of Nations

An international organization established after World War I under the provisions of the Treaty of Versailles. The League, the forerunner of the United Nations, brought about much international cooperation on health, labor problems, refugee affairs, and the like. It was too weak, however, to prevent the great powers from going to war in 1939.

Note

Although President Woodrow Wilson of the United States was a principal founder of the League, the United States Senate refused to ratify the Treaty of Versailles, and the United States never joined the League.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.